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Features
Delta-sigma modulator.
Two stereo input selector.
“Click and pop” suppression circuitry.
Micropower shutdown mode.
24 lead TSSOP package (No heatsink required).
Stereo headphone amplifier.
Description The LM4663 is a fully integrated single supply, high efficiency Class D audio power amplifier solution. The LM4663 utilizes
a continuous time delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width
modulators.
The LM4663 also features a stereo headphone amplifier that delivers 80mW into a 32Ω headset with less than 0.5% THD. The
LM4663 has two stereo inputs that can be selected to drive either the headphone amplifier or the Class D amplifier. All amplifiers
are protected with thermal shutdown.
In standby mode, the LM4663 draws an extremely low 2µA supply current. With a 4Ω load, the IC's efficiency for a 250mW power
level is 69%, reaching 83% at a power level of 2W. The IC features click and pop reduction circuitry that minimizes audible
popping during device turn-on and turn-off. The LM4663 is available in a 24-lead TSSOP package, ideal for portable and desktop
computer applications.
Key Specification
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PO at THD+N = 1%
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2.1W (typ)
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THD+N at 1kHz at 1 Watt into 4Ω (Power Amp)
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0.2% (typ)
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Efficiency at 2 Watt into 4Ω
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83% (typ)
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Efficiency at 250mW into 4Ω
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69% (typ)
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Total quiescent power supply current
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22mA (typ)
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Total shutdown power supply current
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2µA (typ)
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THD+N 1kHz, 20mW, 32Ω (Headphone)
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0.15% (typ)
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Single supply range
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4.5V to 5.5V
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Applications
Portable computers
Desktop computers
Multimedia Monitors
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